PROBLEM TO BE SOLVED: To provide a method for measuring a motion cycle of a living body surface easily without requiring complicated processing even when the living body shakes greatly in a biological motion measuring period.;SOLUTION: A biological motion measuring method for measuring a motion cycle of a living body surface based on a temporal change on an IQ plane of a radar signal irradiated onto the living body surface and reflected from the living body surface includes in the order of descriptions: a radar signal calculation step (S2-4) for calculating a moving distance and a moving direction of a radar signal on an IQ plane of a radar signal for each predetermined cycle shorter than the motion cycle of the living body surface, and calculating a change angle in the moving direction on the IQ plane of the radar signal between the temporally adjacent predetermined cycles; and a biological motion measuring step (Steps S5-7, or Steps S8-10) for measuring the motion cycle of the living body surface based on the moving distance on the IQ plane of the radar signal, and the change angle in the moving direction on the IQ plane of the radar signal.;SELECTED DRAWING: Figure 5;COPYRIGHT: (C)2019,JPO&INPIT
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